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Mergers and Acquisitions (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 07, 2020 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Mergers and Acquisitions |  |  |  |  |  |
Goodwill |  | $ 1,566,524 | $ 1,002,900 | $ 1,566,524 | $ 1,002,900 | $ 1,002,900
CSFL |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Shares of the common stock in exchange for each share | 0.3001 |  |  |  |  |
Number of shares issued as consideration | shares | 37,271,069 |  |  |  |  |
Purchase price | $ 2,261,888 |  |  |  |  |
Value of the conversion of outstanding stock options and restricted stock | 15,500 |  |  |  |  |
Loans at fair value acquired | 12,950,583 |  |  |  |  |
Loans at fair value acquired after initial fair value adjustment | 13,000,000 |  |  |  |  |
Estimated discount on loans | $ 239,500 |  |  |  |  |
Estimated discount on loans (as a percent) | 1.82% |  |  |  |  |
Fair value adjustment on loans acquired |  | 29,800 |  |  |  |
Loans acquired as a percentage of total loans | 113.90% |  |  |  |  |
Credit deficiencies that were identified as Purchased Credit Deteriorated ("PCD") loans. | $ 3,100,000 |  |  |  |  |
Estimated fair value of intangible asset | 140,862 |  |  |  |  |
Goodwill | 563,625 | 563,600 |  | 563,600 |  |
Acquisition costs |  | 21,600 | $ 0 | 65,900 | $ 0 |
CSFL | Core Deposits |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Estimated fair value of intangible asset | $ 125,900 |  |  |  |  |
Estimated economic life of intangible asset | 10 years |  |  |  |  |
Subsequent Fair Value Adjustments | CSFL |  |  |  |  |  |
Mergers and Acquisitions |  |  |  |  |  |
Loans at fair value acquired | $ 29,834 |  |  |  |  |
Estimated fair value of intangible asset | 10,000 | 10,000 |  | 10,000 |  |
Goodwill | $ (36,858) | $ (36,900) |  | $ (36,900) |  |

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